Observations of $A_{1}^{-}$ , $A_{2}^{-}$ and Higher Mass Bosons Produced Near 180° in $π^{-} p \to p {(missing mass)}^{-}$ at 16 GeV/c

We report observations of

A_{1}^{-}

A_{2}^{-}

, and higher mass bosons produced near 180° in

π^{-} p \to p B^{-}

at 16 GeV/c, where

B^{-}

denotes missing mass with negative charge. Differential cross sections for

p A_{1}^{-}

and

p A_{2}^{-}

final states are given. Data obtained in the mass range

1.40 <~ M_{B^{-}} <~ 2.66

GeV are presented and compared with existing evidence for high mass bosons produced near 0°.

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Observations ofA1−,A2−and Higher Mass Bosons Produced Near 180° inπ−p→p(missingmass)−at 16 GeV/c